Jeszcze o początkach bitumicznych pokryć dachowych w Królestwie Polskim

The author supplements a communique published in the previous issue of „Ochrona Zabytkow" by citing the first information found in Polish writings concerning bituminous tar-board which appeared in 1819. In 1823 the production of tar-board on a paper base whose main component was straw, was established near Warsaw. Tar become very popular during the 1830s and 1840s, especially for the purposes of insulation. Tar-board on a cardboard base was used from about the middle of the century and included three varieties: Asphalt Filtz, Stein Pappe and Kalkthur.